@Sven’s answer is the easy way, but it’s rather inefficient for large arrays. If you’re dealing with a relatively small array, you won’t notice the difference, if you’re wanting a profile from a large (e.g. >50 MB) you may want to try a couple of other approaches. You’ll need to work in “pixel” coordinates for … Read more
A slice is an abstraction that uses an array under the covers. cap tells you the capacity of the underlying array. len tells you how many items are in the array. The slice abstraction in Go is very nice since it will resize the underlying array for you, plus in Go arrays cannot be resized … Read more
You are looking for str.rsplit(), with a limit: print x.rsplit(‘-‘, 1)[0] .rsplit() searches for the splitting string from the end of input string, and the second argument limits how many times it’ll split to just once. Another option is to use str.rpartition(), which will only ever split just once: print x.rpartition(‘-‘)[0] For splitting just once, … Read more
This can easily be done using std::vector‘s copy constructor: v2 = std::vector<int>(v1.begin() + 1, v1.end());
Your debut and fin values are floating point values, not integers, because taille is a float. Make those values integers instead: item = plateau[int(debut):int(fin)] Alternatively, make taille an integer: taille = int(sqrt(len(plateau)))
There is no one-liner as you have it in Ruby, but with a helper function you can make it almost as short. Here’s our helper function that loops over a slice, and selects and returns only the elements that meet a criteria captured by a function value: func filter(ss []string, test func(string) bool) (ret []string) … Read more
sort() modifies the array it’s called on – and it isn’t very nice to go around mutating stuff that other code might rely on. slice() always returns a new array – the array returned by slice(0) is identical to the input, which basically means it’s a cheap way to duplicate an array.
The normal way would be slicing: for item in your_list[:n]: …
Part of question regarding out-of-range indices Slice logic automatically clips the indices to the length of the sequence. Allowing slice indices to extend past end points was done for convenience. It would be a pain to have to range check every expression and then adjust the limits manually, so Python does it for you. Consider … Read more
Use function Intn from rand package to select a random index. import ( “math/rand” “time” ) // … rand.Seed(time.Now().Unix()) // initialize global pseudo random generator message := fmt.Sprint(“Gonna work from home…”, reasons[rand.Intn(len(reasons))]) Other solution is to use Rand object. s := rand.NewSource(time.Now().Unix()) r := rand.New(s) // initialize local pseudorandom generator r.Intn(len(reasons))